CentOS 5 Networking :: Multiple NIC - How To Setup VMware Servers

Apr 15, 2009

So I have a pretty big networking nightmare on my hands right now. Stepped into the dog crap with this one, told my employer that I knew how to setup vmware servers right? Its not hard, install CentOS, install vmware, run the config tool, bridge the network, down the road we all go right? We have 3 servers running about 10 virtual servers.

Here is what we have all together.
CFU <- This is the internet. We have IP ranges xx.18.230 - xx.18.241 Gateway is xx.18.254 and subnet is xx.255.128
DELL PowerConnect 3348 Switch <- This is what everything is pretty much jammed into.
VMH1 <- This machine has 2 NICs
eth0 connects to the DELL switch somewhere on the upper 30+ ports
eth1 connects to the DELL switch on port 1.

It uses firestarter and is the gateway for our internal internet on 192.168.11.XX using IP 11.254. It has 4 vm's on it. One of them is the domain controller, hooked to eth1 using IP xx.11.1. The other one is a server for managing remote backups, it has an external IP linked to eth0 of xx.18.234. The other 2 vm's are for misc remote login stations that use internal ip addresses linked to eth1. It hasn't had a single problem communicating on either one of the ports..

VMH2 <- This server hosts a web server, and some other misc stations.
It hosts a web server on xx.18.230 and xx.18.231
It also hosts 2 workstations on a seperate network, through another router that is wireless....

Now, we have the problem child, VMH3
VMH3 <- This hosts...nothing. It sits and has a ton of storage, but does absolutely nothing, but won't communicate out either one of its network ports.
The xx.36.xx and xx.22.xx networks are there because we have multiple businesses in the building that shouldn't see each other.

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General :: Multiple Servers Or One Server With Multiple VMWare?

Feb 7, 2011

I'm looking at setting up a couple automated systems: Here are a few examples:

* Internal accounting system to download and process emails
* Public web server to visit

I could put each system on its own separate box -- for example, it's generally good practice to separate anything that external users have access to (such as a webserver) from internal processes such as accounting. Now, rather than dishing out the money for two separate servers, could I get away with just installing new instances of VMWare on the same box for each system?

To give you an idea, these are not large scale computationally sensitive systems. The accounting one is simply downloading and tallying emails, and the latter is just a webserver with maybe 5 hits per day on a good day. I could definitely pick up a new box for say $50, but I wanted to know the general practice of using VMWare on the same box versus two separate boxes.

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CentOS 5 Networking :: Setup Multiple Bridges For Use With KVM?

Jan 7, 2010

Running CentOS 5.4 x64. Have successfully bridged eth2 with br2 by following the instructions here: [URL]../Networking (under the RHEL section) Have been running several KVM VMs successfully via this bridge.

I am now trying to bridge additional interfaces by using the same routine. Each bridge is named to correspond with the ethX device its bridged with.

Example of ifcfg-eth0 script:


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Networking :: Setup Multiple FTP Servers With Distinct Data Sets With 1 Master FTP Server?

Aug 27, 2009

Faced with disk-bound issues on a FTP server with high traffic. Would like to set up multiple FTP server nodes with dedicated storage for each node where all FTP access is managed by a master FTP server. So, a user would FTP to a single externally visible IP address for the master FTP server and then get routed to the appropriate FTP node. Are the mutiple FTP nodes required or is there a better way of doing this? Perhaps only one FTP server is required and then each node would serve as a separate file server

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CentOS 5 Networking :: OpenVPN Multiple Servers With Clients Access

Dec 27, 2010

what is the best way here? I have like 5 servers, and I want my clients to access each of them, so in case 1 server is down, they can access remaining servers. Also, it will work like user1 chooses the server number and is connecting to a central database, then reply is OK, and he can connect to the server number he wished.

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CentOS 5 Networking :: Multiple Static ISP IP Addresses / Servers Configuration

Mar 31, 2011

I have a CentOS5 server with dual ethernet adapters + Webmin installed as my Router / Firewall / DHCP server working successfully with 1 static IP from my ISP. I also have 7 additional static IP addresses from my ISP needing to configure to individual servers inside my network. I have configured the additional virtual interfaces, but am lost on how to route data specifically from additional ISP address to specific internal network address.

Below is my desired configuration.
98.173.159.xx1 = eth0 physical interface ==> eth1
98.173.159.xx2 = eth0:1 virtual interface ==> ==> CentOS Server 2
98.173.159.xx3 = eth0:2 virtual interface ==> ==> CentOS Server 3
98.173.159.xx4 = eth0:3 virtual interface ==> ==> CentOS Server 4
98.173.159.xx5 = eth0:4 virtual interface ==> ==> Mac OS X Server 1
98.173.159.xx6 = eth0:5 virtual interface ==> ==> Mac OS X Server 1
98.173.159.xx7 = eth0:6 virtual interface ==> ==> Network Attached Storage Server 1
98.173.159.xx8 = eth0:7 virtual interface ==> ==> Windows 2008 Server 1

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CentOS 5 :: Setup One Of Virtual Machines In VMware?

Jan 14, 2010

I am trying to setup one of my virtual machines in VMware with CentOS 5.2

At the welcome to Centos screen I get the following message ??

an error has occurred - no valid devices were found on which to create new file systems. Please check your hardware for the cause of this problem.

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CentOS 5 Server :: Building VMWare Virtual Machines From CentOS Mail Servers?

Oct 12, 2010

I have a few mail servers, a mail log server and a web server running on Centos 5. Now I have a task: to avoid accidental crashes on the production servers while installing updates, my boss asked me to do clones (these clones will all be VMware virtual machines) of the servers (EXCLUDING the actual e-mails and log contents) and then to run those clones on VMWare Server. This way, first I will install and test updates on the clones and - if they will be running without crashes - I will apply the updates on the real production servers themselves.

I have already installed VMWare Server 2.0 I have a few questions: How do I build the virtual machines to exclude the actual mail files and mail logs? Can I use VMware Converter for this purpose, or do I have to use another program? How do I actually do this cloning? Is there a tutorial on how to do this?

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OpenSUSE Network :: 11.2 Xen Bridged Networking - Setup Multiple DomU Through The Default Bridge Setup

Feb 4, 2010

Im trying to setup multiple domU through the default bridge setup. I am able to access only one of them through the network at a time. If you ping one of the domU it works perfectly but you cannot ping any of the others until you stop pinging the one and even then it takes a bit before you can. Ive looked around for a while and seen similar problems but nothing ever seems quite the same. Im probably missing something really stupid. Or is this the way the bridge is supposed to behave? Do i need to use a routed virtual network?


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Debian Configuration :: Multiple Virtual Servers Be Setup In 2 Desktops?

Jun 12, 2010

I now have 2 desktops running debian. I have virtual servers running in desktop 1, and I am hosting my photos using Gallery2. I have copied Gallery2 and the mysql over to desktop 2. I have entered port forward to desktop 1 using port 80 (using my router), and desktop 2 using port 1000. I can only access Gallery2 in desktop1. If I tried to access Gallery2 in desktop 2, I got re-directed to desktop1.


1. Are home routers capable of port forward to more than one computers in a home network behind the firewall of the router? It is Belkin N+ router.

2. Can multiple virtual servers be setup in 2 desktops?

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Ubuntu Servers :: Mail Server Setup For Multiple Domains?

Jul 4, 2010

Im moving all my websites on a dedicated box. I had a cpanel hosting account, and now moving to a terminal and ssh system.I need some advice on choosing my mail setup. I need POP, SMTP, with multiple domains, as host for a few clients.I would like the most simple version.The server will only send +- 100 mails / day.I currently running Ubuntu Linux 10.04.

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Ubuntu Servers :: Mail Server Setup - For Multiple Domains ?

Oct 10, 2010

I have recently setup an Ubuntu 10.04 Minimal x64 Server. I plan on setting it up as a mail server. I need a secure server, that has spam prevention on it. Im setting up around 50 domains and would like a web based control panel. What is the most secure mail server, that i can setup for multiple domains?

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Networking :: Setup VMware's Network Configuration For Red Hat Can Access Internet?

Apr 7, 2010

I installed and tested both Windows server 2003 and Red Hat 9.0 with vmware workstation7. After installing 2003 can access internet but Red Hat can't. I want to test squid proxy server, send mail server, webserver etc. So, I would like to know how to setup WMware's network configuration for Red hat can access internet.

Below link is the configuration of VMware network setup both Server 2003 and Red Hat.

Here is Red Hat Configuration:

Here is Windows Server 2003 configuration:

I am using wireless connection to access internet.

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CentOS 5 :: How To Setup Subversion Server To Run Multiple Projects

Jan 17, 2011

I want to know How to set up Subversion server to run Multiple Projects? I want something to manage it over the web or manage it over kloxo as I am currently using control panel kloxo.

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Ubuntu Servers :: Setup An Outbound SMTP Mail Server With & Using Multiple IP Addresses

Mar 15, 2010

This is the current setup that we have: We have approx 20 clients who pay us to send out a type of e-mail called an E-Blast to their customers. We currently are using 5 Microsoft Windows Virtual Servers to do this. The problem is that those machines are starting to break down. There are times that it will take Microsoft Windows approx 9-10 hours to complete 1 job. This is way too long. We want to move away from Microsoft Windows for this particular type of job as it seems there are more customers who are wanting to use this type of advertising.

It seems that using a Linux Server "Command Line or Shell" environment would be the best way to go as there is no GUI like Windows. Since there is just text...that is something that would/should process very, very quickly.

I am in the process of setting up a new SMTP outbound mail server. This is the current software & configuration (what is installed on this new machine):

All of the customer data (Names, E-Mail Addresses, etc that these e-mails are going to) are currently loaded in a Microsoft SQL Database.

My machine that I am using is plugged into the DMZ. I have 1 ip address for the 1 network card. I have also added/bound 4 more ip addresses to that network card.

I have configured Postfix for Multiple IP Addresses.

I can, from the command line, send successful test e-mails and receive them in my personal account.

As far as I know everything is setup correctly. I can and will post requested information so that it can be verified that everything is setup correctly.

Here are a couple of my questions:

Ensure that I have my Network / Interfaces file and my Postfix's Master.cf/Main.cf files setup correctly?

How can I setup this server to be an Outbound SMTP server and get it to use all 5 of the IP Addresses to send these e-mails quickly?

What can I use to check and ensure that this server is in fact sending out emails on all 5 IP

Addresses (I heard that there is a program named "Postal" that may help in determing this).

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CentOS 5 Networking :: CentOS In Vmware Always Losing Internet?

Apr 21, 2010

I installed CentOS on Vmware server 2.0.2

I took a snapshot of my machine with internet working

If I reboot my machine I lose internet. This makes no sense to me.

I ifconfig eth0 down then ifconfig eth0 up and still no internet

Weird thing

I check ifconfig and my bcast ID is when it is supposed to be

(When the internet is working if I check ifconfig the bcast ID is

IF I change my bcast my internet stops working

If I reboot my machine my internet stops working

I checked /etc/sysconfig/network-scripts/ifcfg-eth0 and I see that in my snapshot (where the internet is actually working) the bcast is at

Without rebooting if I edit that script and I put it to .45.255 my internet stops working

If I reboot my machine at any time my internet stops working

I have also just realized that I cannot ping my gateway..

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CentOS 5 Networking :: Multiple Nics With Multiple Gateway ?

Jun 16, 2009

I have a CentOS 5.3 box with three network interfaces in it. Each interface is attached to a separate VLAN and I want traffic to stay on each network segment.What I can�t figure out is why I cannot get each interface to have its own gateway and everything gets sent through the default gateway.The basically takes my possible 3Gb total bandwidth and throws it down a single 1Gb pipe.Then on top of that, if I take down the interface (ifdown) that has the current default gateway,I loose contact to the other two interfaces.When I look at the routes, each one of the interfaces shows the gw as and defers to the default route. So I delete the route and try to add a new route with:

[root@testsan ~]# ip route add via dev eth2

but end up with the error:

RTNETLINK answers: Network is unreachable

[root@testsan sysconfig]# cat network

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Ubuntu Servers :: Setup A Home Server For Backing Up And Storing The Files On Multiple (Windows) Computers?

Feb 3, 2010

I'm looking to setup a home server for the purpose of backing up and storing the files on our multiple (Windows) computers. What kind of server should I set up? Samba? Lamp?

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Networking :: Getting Two Servers To Communicate (Ping) In VMWare Environment

Dec 18, 2010

I am testing with Suse Linux Enterprise Server 10 in a VMWare environment. I've installed two SLES10 servers, named sles1 and sles2. I can't get the two servers to communicate, even a simple ping won't work. The "Network Adapter" in VMWare is set to "bridged", a setting which has worked fine when installing WinXP in VMWare and connecting to the Internet. I have configured the Network Settings as follows:

-Statically assigned IP Address
-Subnet: (/24)
-Hostname: sles1

Hostname/DNS tab:
-Hostname: sles1
-Domain Name: local
-Name server: blank

Routing tab:
-Default Gateway: (= my router connected to the Internet)
SLES2: same as sles1, with IP and Hostname sles2

With these network settings, the two servers seem totally unable to communciate.
-When I ping sles2 from sles1, I always get the error message: connect: Network is unreachable
-Whatever way I ping, either ping sles2, ping sles2.local, ping, whatever, the error message is always the same.
-Even if I ping sles1 from sles1 (= "pinging myself"), I get the same error message.
-Only if I ping localhost, I get a proper ping result.

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CentOS 5 :: Maintaining Multiple Servers To Same Releases?

Aug 10, 2010

We (like many people) have a QA environment and a production environment consisting of several servers. We want to be able to make sure before we do any yum updates on the production machines that we've tested everything in QA. Unfortunately, yum gets the latest software when you run it, so you could run it two hours apart and up with different releases of some software. We need a solution.

I *think* what I have to do is create my own yum repository. There are a variety of articles on how to do that. But before I go through all that, I wanted to make sure I was on the right track. So the process would probably end up being:

1. Create a fresh repository
2. Upgrade QA from that repository, test, etc.
3. Upgrade production from that repository

Can someone verify this is the correct approach, or is there something easier? It also seems like step 1 is going to take a significant amount of time, plus it will continue to take a significant amount of time every cycle.

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Networking :: Setup Iptables Firewall And DMZ With Multiple Public IP's?

Nov 27, 2008

We have a new Bussiness DSL line with 16 public addresses.What we want is to setup a DMZ to run some services and internet to the LAN. Here's a schematic of what we want:


Backup Internet Main Internet
connection connection
| |
| |
SDSL Modem BDSL Modem


The webserver has the following settings:


What IPTABLES rules do i need to setup to "see" all IP's in the DMZ-2 from the internet?

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Server :: Deploy Centos 5.5 Through Pxe Agent On Multiple Servers?

Apr 14, 2011

We have to install centos 5.5 in approx 60 servers and we want to have a server in which we can create an image of 1 server and deploy it on all other severs through pxe. Mainly all servers will be having raid 5 or raid 1 configured. So the utility should be having the raid support.

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CentOS 5 :: Deploy Kernel For Multiple Servers / VPSs?

Dec 22, 2009

I wonder if there is any fast deploy kernel for multiple servers / VPSs when new kernel is available? Kernel from RHE/CentOS is always old comparing to new versions from kernel.org

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Ubuntu Servers :: Centos 'Setup' Style App

Sep 30, 2010

CentOS has a awesome little command line tool 'setup' which allows you to quickly setup networking etc without a GUI and is far more user friendly than anything Ubuntu has right now out of the box.

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CentOS 5 Networking :: Ifcfg-eth0.bak File Created By Kudzu In VMware Clone Of 5.3

Jul 12, 2010

I run a VMware clone of CentOS 5.3, I observe that kudzu [i.e. /etc/init.d/kudzu, from /etc/rc3.d/S05kudzu or /etc/rc5.d/S05kudzu] detects a MAC address change on eth0 and then creates a /etc/sysconfig/network-scripts/ifcfg-eth0.bak file. This .bak file is identical to the original ifcfg-eth0 file except for the value of the HWADDR [i.e. MAC address] parameter. I would be unconcerned but for the fact that /usr/bin/neat indicates that both ifcfg-eth0 AND ifcfg-eth0.bak are 'Active'. The following solution may help others with the same (or similar) problem:


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CentOS 5 Networking :: VMware ESXi - E1000 Network Adapter Is Not Active And Not Pick Up An IP Address?

Feb 28, 2011

Installed CentOS 5.5 on VMware ESXi server running vsphere 4.1. Installed fine and picked the E1000 network adapter. But can't get the adapter to become active and pick up an IP address. Has anyone done this before? I can't get it to work. When i was testing CentOS out i used VirtualBox and worked fine using bridged networking but just can't seem to get this network card working.I've put some pictures of the config i've got.http:[url]....

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Networking :: Access Multiple Servers From Outside?

Oct 21, 2010

I have an application running inside our lan on server I have configured gateway firewall to direct all traffic on port 80 to port 8080 on So I can access the application from outside lan. Now the problem starts when the application redirects the traffic to another server according to the input of the users. How can I configure the whole system so that I can access the application running on second servers also?

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Networking :: Linking DNS From Multiple Servers?

Jul 14, 2009

I have a wide area network with 7 CentOS servers running Bind and 1 Windows 2003 server. All 8 of these servers handle DHCP and DNS at their respective locations. At each site I can ping computer.site.company I'd like to be able to resolve the dns names from site to site. So from site1 I would like to be able to ping computer.site2.company and get a response.

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Networking :: Multiple PXE Servers Same Network?

Jul 28, 2010

In my environment we are running DHCP on a Windows 2003 r2 server. This DHCP server also is used with Symantec's 3COM PXE for the desktops. So the desktop's can PXE boot into Symantec Ghost and re-image the PC's with a Ghost (GHO) file. This DHCP server is responsible for assigning IP addresses for all desktops on the network.

We also have several branch offices which this DHCP server provides IP addresses to. These branch offices are on a separate network so I believe this is possible. Each branch office is running a Linux server so I would like to use Clonezilla and allow users in these offices to PXE boot to the local Linux server to run Clonezilla and re-image their notebook/desktops with a specified image that is on the local Linux server in each office. My only concern is the use of the same DHCP server. Is this possible?

Another project I am working on is setting up LTSP with openSUSE in which I want to have about 10 or 15 diskless PCs boot up and retrieve the LTSP image but this would also use the same DHCP server and is on the same network as the regular desktops that use the Symantec 3COM PXE service so is this even possible? If not, any recommendation on how I could get it to work? Could proxyDHCP work or MAC filtering or even a seperate VLAN?

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Networking :: Multiple Web Servers With One Public Ip?

Feb 16, 2009

i am working at a place that has 2 physical web servers yadayada1 and yadayada2 but only one public ip address i can use dyndns to register 2 dynamic domains on the same ip address
how can i get yadayadayada1.dyndns.org to route to yadayada1 and yadayadayada2.dyndns.org to route to yadayada2 ?

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